Pope Leo IX

Pope Leo IX (21 June 1002-19 April 1054), born Bruno Etichonen, was Pope from 1049 to 1054, succeeding Pope Damasus II and preceding Pope Victor II.

Biography
Bruno Etichonen was born on 21 June 1002 to Count Hugh of Etichonen, and both the Emperor of the Holy Roman Empire and the Roman delegates agreed to elect him Pope at Worms in 1049. He took on the name "Leo", and he became a powerful secular ruler of central Italy. In 1054 he cited the Donation of Constantine as meaning that the Papal States had authority over the Ecumenical Patriarchate of Constantinople in a letter to Ecumenical Patriarch Michael I, leading to the Great Schism between Catholicism and Orthodoxy.